Another reason could be that if SC railway allow AC special to Run aggressive ,it will reach BZA before 12728 Godavari exp ,which will mean Godavari will trail this train Godavari always gets priority byvSC controller throughout its journey .2 nd Reason During normal time lot of train arrive &depart from. Bza between 2200 to 0100 hours , falknuma ,sangmitra ,GT ,Jaipur exp/Chapra Shesadari ,visakha ,ypr hwh duronto ,TN , A P ,Ghy to TVC,SBC bound exp to name few trains .PF availablity is a big issue at BZA so railway have given enough slack to 12784